Turbulent burning velocities for methane/air mixture at pressure ranging from atmospheric pressure to high pressure ≤ 1 MPa and mixture temperatures of 300 K and 573 K were measured, which covers the typical operating conditions of premixed-type gas-turbine combustors. Based on the contours of the mean progress variable c = 0.1 determined using OH-PLIF images, turbulent burning velocity was measured. The ST/SL was also greatly affected by pressure for preheated mixtures at 573 K. Bending tendency of ST/SL curves with u′SL was seen regardless of pressure and mixture temperature and the Rλ region where the bending occurs corresponded well to the region where the smallest scale of flame wrinkling measured as a fractal inner cutoff approaches the characteristic flame instability scale and becomes almost constant. A power law of ST/SL with (P/P0)(u′/SL) was clearly seen when ST was determined using c = 0.1 contours, and the exponent was close to 0.4, indicating the agreement with the previous results using the mean flame cone method and the significant pressure effects on turbulent burning velocity.
|Number of pages||1|
|Publication status||Published - 2004 Jan 1|
|Event||30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States|
Duration: 2004 Jul 25 → 2004 Jul 30
|Conference||30th International Symposium on Combustion, Abstracts of Symposium Papers|
|Period||04/7/25 → 04/7/30|
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